Trifluoroacetic acid → 4-((3S,4S)-3-Amino-4-hydroxypyrrolidin-1-yl)-N-(4-(chlorodifluoromethoxy)phenyl)-3-(1H-pyrazol-5-yl)benzamide

Participants

Reaction Conditions

Reaction Steps

1-(Tetrahydro-2H-pyran-2-yl)-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole (82 mg, 0.288 mmol) and PdCl2(dppf)-(CH2Cl2) (10.07 mg, 12 μmol) were added to a mixture of 4-((3S,4S)-3-amino-4-hydroxypyrrolidin-1-yl)-3-bromo-N-(4-(chlorodifluoromethoxy)phenyl)benzamide (Stage 76.1, 100 mg, 0.206 mmol), Na2CO3 (0.308 mL, 0.617 mmol) in DME (2 mL) under argon atmosphere and the RM was heated at 80° C. for 4 h. The RM was filtered through Hyflo® and the solvent was evaporated off under reduced pressure to give a residue which was purified by flash chromatography (Silica gel column, 12 g, DCM/EtOH from 98:2 to 8:2). The resulting intermediate was dissolved in DCM (2 mL), treated with TFA (0.198 mL, 2.57 mmol) and the RM was stirred for RT for 3 h. The solvent was evaporated off under reduced pressure and the residue was treated with sat. aq. Na2CO3, and extracted with EtOAc. The combined extracts were washed with brine (20 mL), dried over Na2SO4 and the solvent was evaporated off under reduced pressure to give the crude product which was purified by flash chromatography (Silica gel column, 12 g, DCM/MeOH from 95:5 to 7:3) and crystallized from n-hexane/DCM to give the title product as a beige solid. HPLC (Condition 7) tR=5.774 min, UPLC-MS (Condition 3) tR=0.77 min, m/z=464.2 [M+H]+; 1H-NMR (400 MHz, DMSO-d6) δ ppm 2.73-2.99 (m, 2H) 3.22-3.44 (m, 3H) 3.93-4.04 (m, 1H) 5.33 (br. s, 1H) 6.39 (s, 1H) 6.74-6.94 (m, 1H) 7.31 (d, J=8.60 Hz, 2H) 7.76-8.03 (m, 4H) 10.17 (br. s, 1H).

Provenance & Evidence